Michor, H., Steiner, S., Schumer, A., Hembara, M., Levytskyy, V., Babizhetskyy, V., & Kotur, B. (2017). Magnetic properties of HoCoC2, HoNiC2 and their solid solutions. Journal of Magnetism and Magnetic Materials, 441, 69–75. https://doi.org/10.1016/j.jmmm.2017.05.038
Rare-earth transition metal carbides; Magnetic properties; Crystalline electric field; Charge density wave; Heat capacity
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Abstract:
Magnetic properties of single crystalline HoCoC2 and the evolution of magnetic and structural features in a series of polycrystalline solid solutions HoCo1−xNixC2 are investigated by means of X-ray diffraction, magnetization, magnetic susceptibility and specific heat measurements. The crystal structures of all investigated samples refers to the CeNiC2-type structure (space group Amm2 and Pearson symbol oS8). Non-isoelectronic substitution of Co by Ni causes a non-linear increase of the unit cell volume and especially a non-monotonous variation of the a and c lattice parameters as well as a pronounced reduction of the C–C bond length of carbon dimers. Temperature dependent magnetization and specific heat measurements reveal a crossover from a ferromagnetic for HoCoC2 with Tc= 10.6(1) K to an antiferromagnetic ground state for HoNiC2 with Tn= 2.78(6) K and a non-monotonous variation of the magnetic ordering temperature with a minimum at intermediate compositions. Crystalline electric field effects of HoCoC2 and HoNiC2 are analysed using combined thermodynamic and magnetic susceptibility data. The electrical resistivity of HoNiC2 displays a distinct anomaly near room temperature which indicates the formation of a charge density wave (CDW) state as earlier reported for several other rare earth nickel dicarbides.
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Additional information:
The final publication is available via <a href="https://doi.org/10.1016/j.jmmm.2017.05.038" target="_blank">https://doi.org/10.1016/j.jmmm.2017.05.038</a>.
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